Chub/tʃʌb/ Definition 1 of 2Pro Tip 1/3Fish Species Chub refers to several fish species, not just one; learn its varieties. The creek chub is different from the European chub. Pro Tip 2/3Habitat Specific Chubs are often in freshwaters; think rivers, not oceans. We'll find chubs in freshwater lakes, not in the sea. Pro Tip 3/3Fishing Context Chub is commonly used among anglers, less familiar to others. Let's go chub fishing this weekend at the stream.